4-Chloroindole-3-acetic acid (4-Cl-IAA) is an organic compound that functions as a plant hormone.

4-Cl-IAA is found in the seeds of a variety of plants, particularly legumes such as peas and broad beans.

[2][3][4][5] In one study it is written that the substance is "mainly found in reproductive structures" and "is thought to be restricted to members of the leguminous tribe Fabeae, specifically "the genera Vicia, Pisum, Lathyrus, Lens, and Vavilovia".

[7] Engvild hypothesized in 1996 that 4-Cl-IAA may be a "death hormone" that maturing seeds use to trigger death of the parent plant by mobilizing nutrients to be stored in the seed.

[8] Lam et al found the substance in the seeds of Medicago truncatula, Melilotus indicus, and three species of Trifolium.